Why would the Nazi's pour so many resources into this strategically insignificant island, and hold onto it at all costs even at the end of the war when the end was surely near? What dark secrets lie buried in the tunnels, bunkers and watchtowers dotting Guernsey?
Nearly seven decades after D-Day, a massive Nazi artillery base the size of four football fields is found near Omaha and Utah beaches.
Built by a mysterious German engineer in an inhospitable location, the structure contains strange and suspicious tunnels, bunkers and more. Was this a secret Nazi base for Uboat resupply, or were there darker purposes for the house?
One of the largest bunkers ever constructed, the Blockhaus is built under immense secrecy, utilizing unimaginable engineering feats, and is a potential game changer for Hitler at the tipping point in the war.
A secret weapons program that could have ended badly for the allies. In the heart of Austria, a bunker and network of tunnels were discovered based on a long lost 1944 German report that indicated what the Nazis were up to.
As the Red Army approaches a forest in Poland at the end of the war, they stumble upon a massive complex containing over a thousand structures across 25 sq km. How did the Germans keep this colossal base secret from allied intelligence?
Guided missiles, the Wasserfall, and the war-changing V2 were dreamed up and tested in Peenemunde, a German seaside city suddenly overtaken by Nazi elite. Along the Baltic coast, scientists like Wernher von Braun, designed and tested weapons to bring the Allies to their knees.
Germany's preparations for WW2 began years before 1939. Under various guises, Germany began work on what would become their most technologically advanced front.
In Poland lies a forgotten Nazi complex which could have sheltered up to 27,244 people from Allied bombs, the purpose of which largely remains a mystery.
Hidden in a remote mountainous forest is a structure nicknamed the Fly Trap or Hitler's Stonehenge. Researchers still have no definitive idea what it is.
Outside the town of Pölitz lie the ruins of what was once one of Germany's most important assets - a place that kept the German war machine moving.
When the Nazis took Ksiaz Castle, it wasn't for the view. Secret staircases and lifts were built, while underneath, a vast network of tunnels was taking form.
Built in 1934, Ordensburg Vogelsang, a virtual Nazi Castle was constructed with the intention of building the New German; elite future leaders of the Reich.
What shadowy plans were taking shape inside an SS castle?
Allied forces stumble across a sprawling complex in the French countryside. What did the Nazis have planned for this mysterious Nazi stronghold?
A chilling discovery in the furthest reaches of Eastern Canada hints at the true depths of the Nazis' seafaring capabilities.
Scientists in Kamienna Gora work to keep the Luftwaffe flying but are they also building Hitler's next revenge weapon?
A vast network of Nazi bunkers buried in the Hague tells the story of the greatest battle of WWII that never was.
Where are the missing billions? Exploring the tunnels, lakes, and secret caches used by the Nazis to hide spoils of war.
Why did the Nazis fight tooth and nail to protect the city of Luban? Abandoned factories, hidden tunnels, and strange rumours provide clues to the mystery.
With Nazi Germany's rise to power, a long-abandoned canal project in East Prussia is resurrected, but the true purpose of this massive waterway comes into question.
As Hitler's shadow engulfs Europe, ancient castles across the continent fall under Nazi control and are transformed to serve the ambitions of the Third Reich.
In 1942, a mysterious technology is facilitating a deadly Blitz. Desperate for answers, British intelligence sets its sights on an installation in Bruneval, France.
As Allied bombing raids escalate, a massive concrete dome rises from the French countryside, reportedly concealing a crucial component of Hitler's plan.
After the Allied landing in Normandy, France falls city after city - but a small island fortress off the coast becomes the stage for a harrowing act of Nazi defiance.
Deep in the forests of East Prussia, a sprawling Nazi complex becomes the nerve centre of Hitler's empire - and the site of a daring plot against the Fuhrer.